doc: clarify experimental API elements in vm.md

Remove redundant "should not be considered stable" (it immediately
follows a clause saying that it is "experimental") and replace with a
more clear (to me, at least) statement that we don't recommend using the
feature in production.

PR-URL: #35594
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/vm.md

@@ -87,8 +87,8 @@ changes:
   * `importModuleDynamically` {Function} Called during evaluation of this module
     when `import()` is called. If this option is not specified, calls to
     `import()` will reject with [`ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING`][].
-    This option is part of the experimental modules API, and should not be
-    considered stable.
+    This option is part of the experimental modules API. We do not recommend
+    using it in a production environment.
     * `specifier` {string} specifier passed to `import()`
     * `script` {vm.Script}
     * Returns: {Module Namespace Object|vm.Module} Returning a `vm.Module` is
@@ -981,8 +981,8 @@ changes:
   * `importModuleDynamically` {Function} Called during evaluation of this module
     when `import()` is called. If this option is not specified, calls to
     `import()` will reject with [`ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING`][].
-    This option is part of the experimental modules API, and should not be
-    considered stable.
+    This option is part of the experimental modules API. We do not recommend
+    using it in a production environment.
     * `specifier` {string} specifier passed to `import()`
     * `script` {vm.Script}
     * Returns: {Module Namespace Object|vm.Module} Returning a `vm.Module` is
@@ -1079,8 +1079,8 @@ changes:
   * `importModuleDynamically` {Function} Called during evaluation of this module
     when `import()` is called. If this option is not specified, calls to
     `import()` will reject with [`ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING`][].
-    This option is part of the experimental modules API, and should not be
-    considered stable.
+    This option is part of the experimental modules API. We do not recommend
+    using it in a production environment.
     * `specifier` {string} specifier passed to `import()`
     * `script` {vm.Script}
     * Returns: {Module Namespace Object|vm.Module} Returning a `vm.Module` is
@@ -1158,8 +1158,8 @@ changes:
   * `importModuleDynamically` {Function} Called during evaluation of this module
     when `import()` is called. If this option is not specified, calls to
     `import()` will reject with [`ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING`][].
-    This option is part of the experimental modules API, and should not be
-    considered stable.
+    This option is part of the experimental modules API. We do not recommend
+    using it in a production environment.
     * `specifier` {string} specifier passed to `import()`
     * `script` {vm.Script}
     * Returns: {Module Namespace Object|vm.Module} Returning a `vm.Module` is